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- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
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Posts from...
Thursday, December 6, 2007
In the loop powered IS transmitters in the field , 24 VDC comes from DCS I/O card or the barrier?
New Replies:
By Anonymous on 6 December, 2007 - 11:57 pm -
By Anonymous on 6 December, 2007 - 11:57 pm -
What will be the connection in case of NON IS transmitters?...
By Bryce Gillan on 6 December, 2007 - 10:41 pm - The barrier's IS side is connected to the transmitter, thereby powering the 4 to 20mA current loop...
By Steve Yates on 6 December, 2007 - 10:03 pm - If shunt-diode (zener) barriers are used, then the power could come from the I/O card or a separate...
By kumaran on 6 December, 2007 - 9:55 pm - For loop powered IS transmitters, power supply of 24 V DC comes from 24 V DC power distribution...
By Roy Matson on 6 December, 2007 - 9:53 pm - Friend,
It all depends on the barrier. If it's a simple Zener barrier it probably comes from the...
What is the best communication system for oil well surveillance?
Link to old Bailey pneumatic controls for the boiler feedwater steam driven pumps.
Feedwater Master Controller and individual pump controller interaction.
I have Frequency Inverters and Soft-Starters from WEG. They are MODBUS/RTU capable, and I started to link them to the computer through RS485 network.
New Replies:
By Fred Loveless on 6 December, 2007 - 10:40 pm -
By Fred Loveless on 6 December, 2007 - 10:40 pm -
Although we have not tested with these particular Modbus RTU protocol devices you should be able to...
I am trying to determine if commercially available RS485 optical isolators that say they can be used for Modbus can necessarily be used on Modbus Plus
What to do with an old power supply?
New Replies:
By MH on 6 December, 2007 - 10:37 pm -
By MH on 6 December, 2007 - 10:37 pm -
Hi CSA, that would be Salem then? Or is there another GE operation in Europe that would undertake...
Adding the Extended Trend Block to an already installed system
Question about AC servo motor drives
New Replies:
By Rick B on 6 December, 2007 - 10:34 pm -
By Rick B on 6 December, 2007 - 10:34 pm -
The motor specs from Emerson state that it uses neodymium magnets (I'm assuming that's a permanent...
Finding a solution for expensive D-I/O for Foundation Fieldbus
New Replies:
By Zare on 6 December, 2007 - 10:33 pm -
By Zare on 6 December, 2007 - 10:33 pm -
We intend to upgrade the control system of our plant which is "Pneumatic" &...
Can anyone point to available references?
New Replies:
By Walt Boyes on 6 December, 2007 - 10:32 pm -
By Walt Boyes on 6 December, 2007 - 10:32 pm -
The first practical "multimeter" was the Simpson Model 260, an analog volt-ohm-meter...
By Steve Yates on 6 December, 2007 - 10:23 pm - First one I ever used was an Avo 7, Avo website is http://www.avo.co.uk/uk/about/index.php
If...
Need help of using unity pro...
New Replies:
By Dweebyone on 6 December, 2007 - 10:27 pm -
By Dweebyone on 6 December, 2007 - 10:27 pm -
Hi,
I am sure your local Schneider will support you, if you purchased the s/w, and h/w from...
How to R/W tags using Softnet OPC when you don't have PLC sw source?
What is the simplest algorithm for a TON timer that can be paused?
to monitor machineries down time (Running and stopped time)
New Replies:
By Steven on 6 December, 2007 - 10:21 pm -
By Steven on 6 December, 2007 - 10:21 pm -
Maybe the Trend ActiveX is a very good solution. Also it can help you save your money. You can find...
Failure to perform GE frame 9FA Compressor Blade Wash-Mark VI Speedtronic
New Replies:
By Almshouse on 6 December, 2007 - 10:19 pm -
By Almshouse on 6 December, 2007 - 10:19 pm -
markvguy,
Cimplicity has the ability to display tagname of point of item on the screen along...
AOS replacment with Siemens OP27 or Delta touch screen
The Fieldbus real limitation is within the scan time?
How to convert raw values to engineering units
We are in the middle of design for one of the most complex fish hatcheries ever to be built in North America. Our engineering consultant is recommending standard PLC and SCADA alarm and control system but one of our staff is really pushing a WinPLC based system...
New Replies:
By Victor Robert on 6 December, 2007 - 10:02 pm -
By Victor Robert on 6 December, 2007 - 10:02 pm -
...More thoughts on product selection.
We choose what we are familiar with. Any of us could get...
from the Automation List department...
Boiler Feedwater Pump Control in Steam-powered Pumping StationControl for a boiler feedwater system which is to continously supply feedwater at 240 psig to a steam turbine plant.
New Replies:
By jojo on 6 December, 2007 - 9:59 pm -
By jojo on 6 December, 2007 - 9:59 pm -
Some questions first:
1. What is the capacity of the electric driven motor feed pump, same as...
In a two gen system, two gen which were sharing equal load,one gen is disconnected and then after frequency for both reached 50hz ,gen is resynchronised in the network. so should they share same load as earlier or not?
New Replies:
By vedika on 6 December, 2007 - 9:58 pm -
By vedika on 6 December, 2007 - 9:58 pm -
I am using normal controllers which have set points, lower and upper limits and can be set up to...
Internal pressure drop for full opening valve
I want to use potential earth of a three phase system as a zero wire.
New Replies:
By Phil Corso, PE on 6 December, 2007 - 9:55 pm -
By Phil Corso, PE on 6 December, 2007 - 9:55 pm -
Juigi, in response to your 01-Dec (10:48) question...
By electrical-code (NEC in the USA) the...
How to configure TDC3000 tags in OPC server?
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